Method of making reenforced closures



E. F, HULBERT A METHOD OF MAKING REENFOBCED1-ICLOSURES Filed Oct. 23,1925 June 29 1926.

A TTORNEYS (III/I FMA-2 TML Patented June 29 1926.

UNITED* STATES PATENT OFFICE.u i

i EDWIN F. HIULBEBT, OF MILWAUKEE, WISCONSIN, ASSIGNOR., BY MESNEASSIGN- I `rMENTS, T TEE MASTER PACKAGE-CORPORATION 0F DELAWARE.

'METHOD 0F MAKING REENFORGED CLOSUBES.

Application led October 23, 1925. Serial No. 64,473.

Theinvention relates to a method of making reenfonced closures.

`The object of this invention is to provide a method of attaching adished head to the fibre siding of the container, whereby the flangedportion of said head is gripped-between parts of said sidingY and isfirmly clamped thereto by a metal band which also clamps the diskportion of said head between it and the dished portion of said head.

The invention further consists in the several features hereinafter setforth and more closure,.with parts broken away and parts shown insection. f

` The fibre siding 6 of pressed pulpror wound fibre orpaper, in the formof cylindrical or conical tubingkis firmly held beltween an internalchuck 7 andan external contractible chuck 8, and a dished bre head part9 is inserted in the siding and clamped against the chuck 7 by aclamping plunger 10. The chuck 8 has a relief surface 11 to provideclearance between it and the upper edge 12 of the siding, and a plunger13 having an annular part 13 provided with a curved edge 14 worksbetween the chuck 8 and the plunger 10 and is moved down Vfrom theposition shown in Fig.- 1 to turn the edge 12 over the top of the iiange15 and into the space between said iiange and the plunger 10, afterwhich plunger 'l0 and chuck 8 are withdrawn and the disk part 16 of thedished head is inserted.

Flg. 5 is an elevation view of the finished plied to .the outer side ofthe siding and a thin sheet-metal band 19, having a base flange 20 and aslightly curvedl upper edge 21, is inserted within the bent-over edge 12of the siding so that the parts are positioned as shown inA Fig. 2.

Thereafter, a plunger .22, having an annular forming part 23 `providedwith a curved edge 24, is moved down between the` chuck 18 and theplunger 17, and during its movement bends the edge 21 of the band 19over the arched portion 25 of the siding, and during the last part ofthe travel of the plunger 22 the fiange"15, with said arched portion, isforced over the head against the ange 20 and the edge- 21 of the band isforced into the siding.

The above described method results in the construction of a very strongclosure, as the parts projectin from the head form a multi-ply ed e reenorced bythe metal band 19, and a su stantial head-rest for the disk saiddished headv member, positioning a metal band within the bent-over edgeof the siding, and exerting pressure on said band to clamp it over saidbent-over edge and against the disk head member.

2l. The method of forming a reenforced fibre container which consists inbending an edge portion of a siding over the fianged portion of a dishedhead member inserted. within the siding, inserting a disk head memberwithin the bent-over edge of. the siding and against said dished headmember, positioning a metal band having a' base flange within saidbent-,over edge with itsiiange adjacent the siding,v bendin'the upperedge .of the handover the bentbverv edge of the siding andvforcingsaidbent-u le() over edge laterally over the main body pormetalband adjacent" said flanged portion tion of the head. and displaeinthese crimped portions lat- 3. The lmethod of making a reenforced erallyto firm y clamp the siding and the fibre container having a dished head,which head between the outer edge of the band 5 consists in crimpingtogether the upper end and the inner part of the band.

of the siding, the flanged portion of the In testimony whereof, I aix mysignature. dished head, and a portonof an angled EDWIN F. HULBERT.

